Concatenate two rows value with same id but different column values

Question

How can I merge multiple rows value with the same ID

When the value in the first and second row in the same column is the same. How can I merge this?

Please see attached image.I want highlighted column

For eg

I want to get the table:

A/b  ID  SUFFIX   Identify No        MERGED id
CON  123     C    12345-33344441-8   123-456
CON2 456     C1   12345-33344441-8   123-456

How can I merge multiple rows values with the same ID?

When the value in the first and second row in the same column is the same. How can I merge this?

For eg

I want to get table:

A/b  ID   SUFFIX   Identify No            MERGED id
CON  123  C        12345-33344441-8       123-456
CON2 456  C1       12345-33344441-8       123-456

Answer 1

I am guessing you want to concat all ID columns for matching IdentityNo
If that is so, you can do it like this

select t.ab,
       t.id,
       t.suffix,
       t.identifyno,
       ( select string_agg(convert(varchar(50), t1.id), '-')
         from   table1 t1
         where  t1.identifyno = t.identifyno
       ) as merged_id
from   table1 t

Try it yourself in this DBFiddle

This approach also has no problem when the rows are ordered in such a way that the matching IdentifyNo are not nice after each other.

Assuming that is what you are after off course

EDIT (after the OP changed the column names)

New DBFiddle

New query

select t.id,
       t.primary_Secondary,
       t.id2,
       t.PassportNO,
       ( select string_agg(convert(varchar(50), t1.id2), '-')
         from   table1 t1
         where  t1.PassportNO = t.PassportNO
       ) as merged_id
from   table1 t

Result from new query

id	primary_Secondary	id2	PassportNO	merged_id
1	Pri	242	12345-789	242-342
2	Sec	342	12345-789	242-342